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Substrate Material: |
BK7 optical glass |
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Outer Diameter/Dimension: |
50.8x50.8,+/-0.2mm |
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Thickness: |
6.0,+/-0.2mm |
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Surface Quality: |
Single-side polished(SSP); 40-20 scratch and dig |
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Flatness: |
<Lambda/4 @ 633nm per 25mm |
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Chamfer: |
<4-corner with radius 1mm,ground surface |
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Coating: |
Single side silver coating, with protection layer SiO |
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Reflectivity: |
Ravg > 97% for 450nm - 2,000nm & Ravg > 95% for 2,000-20,000nm
(Ravg>96% from 400nm-700nm, Ravg>96% from 700nm-2.0um)
Note: protective SiO overcoat protects from oxidation
Silver coating highly reflects in visible and NIR range |
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Parallelism: |
<3 arc minutes |
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Clear Aperture: |
>90% of reflective surface |
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Back Surface: |
Back surface: ground (120-grit) |
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Damage Threshold: |
>0.5J/cm2 (10ns pulse, 1064nm) |
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Packaging: |
Vacuum packaged(sealed) |